Hennessy Lake is a Lake located in Cochrane, Ontario and has an elevation of 245 meters.

• Latitude: 49° 18' 20'' North   (decimal: 49.3055555)
• Longitude: 82° 23' 51'' West   (decimal: -82.3974999)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: Ontario
• Elevation: 245 meters
• Location: Cochrane
• Atlas of Canada Locator Map: Hennessy Lake
• GPS Coordinate Locator Map: Hennessy Lake Lat/Long